Double-acting force-pump



PATENT OFFICE- D. W. CLARK AND S. GRAY, OF'BRIDGEPORT, CONNECTIGUT.

DOUBLE-ACTING FORCE-PUMP.

Specification of Letters VPater-1t l1`\To.

12,092, dated December 19, 1854.

To all 'whom may concern:

Be it known that we, D. W. CLARK and S. H. GRAY, of Bridgeport, i-ny theycounty of Fairfield vand State of Connecticut, have invented a new anduseful-Improvement inV Force-Pumps;l and we do hereby declare that thefollowing is a full and exact description of the same.

The nature of our improvement consists in furnishing the barrel ofthepump withv two pistons, the rod of one piston passing through theinterior of the other rod, which 'is made hollow for that purpose, thetwo piston rods being connected by means of link levers with one brake,in such a manner that both pistons are simultaneously operated.

To enable others skilled in the art to make and use our invention, wewill proceed to describe its construction and operation, reference beinghad tothe annexed drawings, forming a part of this specification, inWhich- Figure l, is a sideelevation of our improvement. Fig. 2, is aside vertical section of the same. Fig. 3, is a horizontal plan sectionthrough lines,

Similar letters of reference indicate the same parts.

A, is the board or support to which the pump is secured; B, the barrelof the pump; C, lower piston; C', pistbn rod of same; D, upper piston;D', rod of same; E, stufng box through 'which the piston rod D', passes;F, stuflng box through which piston rod C', passes; G, Gr', connectinglinks which unite the head D3, of piston rod D', with the cross leversH, H'; I, I', connecting links which unite the head C3, of piston rodC', with levers H, H; J, connecting links which unite the head of rodC3, with the brake K; L, supply pipe; M, N, supply and dischargechambers; O, P, Q, orifices in the pump barrel; R, valve of the supplypipe; S,

valveof the air chamber; T, air chamber;

ders the working of piston rod D', tight.

`The upper Vpart of the piston rod D', is also furnished with a stuffingbox F, which renders theworking of piston rod C', tight.

The' piston rod C', is4 connected with the brake K, by means ofconnecting links J ,l which pass from the extremity of the brake to head(03,) of the piston rod.

The lpiston rod D', is connected with the brake, by means'of connectinglinks G, Gr', which'pass from the head (D3) of the piston rod D', to thecross levers H, H', These levers turn upon a center pin V, which fas'-tens in the board A.-` The upper ends' of the cross levers are connectedwith the links J, by means of the intermediate links I, I'.

By the act of pushing down the brake K, piston C, is raised toward thecenter of the barrel, and piston D, correspondingly depressed. Piston D,traverses the upper of the barrel, and piston C, the lower There areorifices in the barrel at O, P, Q, for the inlet and exit of the fluid.The two chambers M, N, are placed side by side, both receiving waterfrom the supply pipe L, at their junction with which each chamber isprovided with a valve, the valve R, of chamber M, only, being shown inFig. 2. Both chambers also empty into the air chamber T, at theirljunction with which both are furnished with a valve, the valve S, ofchamber M, being the only one shown, y

(Fig. 2).

The chamber M, supplies and conveys away the Huid which enters andleaves the barrel through orifices O, Q. The chamber N, supplies andconveys away the iiuid which passes orifice P.

By the act of pressing down the brake K, the pistons C, D; approach thecenter of the barrel, piston C', producing a vacuum in the lower part ofthe barrel, while piston D, produces a vacuum in the upper part of thesame. Accordingly, the water, rushing up the supply pipe L, VliftsvalveiR, of chamber M, and fills both vacuums; the inward passage of thefluid-is indicated by! arows 1, 2, 3, 4, 5, 6, 7.

The intermediate space in the barrel between the two pistons, issupplied and discharged through the orifice P. When the brake is pusheddown and the two pistons approach each other, the water between them isexpelled through P, into the chamber N, and rises through the same inthe direction of the dotted arrows, into the air chamber T, the ingressvalve at the bottom of chamber N, being, of course, closed.

When the brake K, is pushed up, the water in the previously formedvacuums is eX- pelled through the orifices O, Q, and passes up throughchamber M, into the air cham` ber T, in the direction of the red arrows.

By the upward movement of piston D, and the downward movement of pistonC, a vacuum is `formed between the pistons, which is lilled by theentrance of water through chamber N, and orifice P. Thus, while thewater is being discharged above piston D, and belowpiston C, a vacuum isformed betweenthe two pistons, which is being filled by means of adistinct chamber (N), which is connected with the supply pipe (L), andair chamber T. It should be observed that the piston rod C', passes forconvenience through the middle of the center pin V. I

The positions of the moving parts, when the brake K, is pushed down,are'vshown by the dark lines, Fig. 2, and the position ofv brake, bymeans of the connecting links and cross levers, in the manner described.

\ DAVID W. CLARK.

SYLVESTER H. GRAY. Witnesses:

SAMUEL WINE, JOHN SMITH.

